Backpack



FIG. 1 is a perspective view of a backpack, showing a first embodiment of my new design;

FIG. 2 is a right-side elevational view thereof;

FIG. 3 is a left-side elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a perspective view of a second embodiment thereof;

FIG. 9 is a right-side elevational view of FIG. 8;

FIG. 10 is a left-side elevational view of FIG. 8;

FIG. 11 is a front elevational view of FIG. 8;

FIG. 12 is a rear elevational view of FIG. 8;

FIG. 13 is a top plan view of FIG. 8; and,

FIG. 14 is a bottom plan view of FIG. 8.

The ball patterns depicted by broken lines in FIGS. 1, 4, 8, and 11 have been shown for the purpose of illustrating portions of the backpack that form no part of the claimed design.

The remaining broken lines represent stitching which is part of the claimed design. 

CLAIM I claim the ornamental design for a backpack, as shown and described. 